cirkit
......I would like to ask that how do we know that if it's a BUG or an error only limited to our server?
By reporting it in bugzilla. If it's not a bug then you will be told so and you can then come back to the forums with a general request for help.
If developers and/or people who assist with bug resolution think it looks like it could be a bug, then the matter will be investigated further (in bugzilla) and you will likely be asked to provide more information.
The message at the top of ALL new posts says:
"Don't report problems here - Please report bugs and potential bugs in the bug tracker"
Note the words "problems", "bugs" and "potential bugs".
Therefore you do not need to have accurately determined that your issue is a bug.
Simply said, if something is not working correctly or as expected then report it to bugzilla. You will then be steered in the right direction.
Obviously if you are just asking for help re how to do this or that etc, then that clearly is not a bug, so some degree of initial filtering is required.
It seems though that some people err on the side of reporting problems in the forums first, as a means of determining whether the problem is a bug, and/or hoping they will get a resolution in the forums.
There is a strong push in this community and general preference by developers etc, to report anything resembling a problem which could be a bug, to bugzilla first, rather than to the forums first.
Even a report that turns out to not be a bug, is therefore well documented and easily searchable (in bugzilla), by future users who have the same problem.
So please get in the habit of using bugzilla, as bugzilla is the tool of choice here.
If you can post to these forums and use & install sme server, then you are certainly capable of using bugzilla.